Is this a trick question? If you say there aren’t any prescribed takeoff minimums for Part 91 operators, you would be correct; however, just because something is legal doesn’t make it smart. You might even have heard an instructor saying you can take off if it’s “zero-zero.” That advice is as impractical as it is, well, stupid. Flying involves risk. We can’t let ourselves be paralyzed by those risks, but we certainly need to manage them, so here are some factors you might want to consider in… (www.flyingmag.com) Ещё...

Amen again! I still like the basic 135 minimums, 2 engines or less, 1 mile vis., 3 engines or more, 1/2 mile. And for those of you who haven't had a real engine failure shortly after takeoff, congratulations, and in a single the survival odds are in your favor. In a piston twin, unless you do everything just right they certainly are not. So why complicate it by not being able to see? And if you really want to think safety, part 135 takeoff minimums are published and readily available. And they are airport specific, i.e. terrain, obstacles, etc. The old adages about old pilots, bold pilots, and all that's legal, isn't necessarily safe will serve you well. Accident statistics won't if they are yours.

Personally, I won't takeoff if it's below 200ft and 1/2 mile visibility unless it's a really thin layer with an alternate above minimums nearby. The Cessna 310 crash at PAO (Palo Alto, CA) 2.5 years ago that killed 3 Tesla Motors employees is a big reason for that. I was based at SQL (San Carlos, CA) at the time of the crash and remember the weather that day and can't imagine taking off in that, especially on a 2400ft runway with no centerline lighting. The NTSB's probable cause was essentially spatial disorientation: http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20100217X24906&key=1

I came across Bill Butler post over a year old and had to laugh out loud. Similar circumstance: Flying form on a Delta Sierra wx night at 200' stepped down. Both a/c were broken. Lead had good navigation and we had good weapons systems. I broadcasted on guard " hey Skipper, this is stupid". He agreed and we RTB'd.

True zero zero is just plain scary. If you have trouble driving to the airport wait.Let us not forget that even though part 91 has no published minimums if the DP has a ceiling and or visibility minimum stated they do apply to part 91 operators.

Well, I guess we have all made a gut check in times past and broke out pretty quick, plane's flying good and all is cool, but wherever you fall in here and whatever you get by with, with this old boy, there is always a little bit and at times a whole lot of pucker factor, along with a lot of prayer. Unless pressed real hard, I never had a real good feeling lining up a centerline and not being able to see the other end of the runway. That said, I only remember one time when the boss man said we really needed to go and it was bad trashy; we did; all was fine but we didn't break out til about 8 grand. He was in the jump and I got to see him wipin' sweat and breathing a sigh. He informed me that I was the pilot and not to listen to him aagain, at least about that.

Since ODPs are always optional for Part 91 (although I'd agree you'd almost always want to follow them in LIFR), the only case I could see the DP minimums being regulatory is if you were assigned a SID with ceiling/visibility in the takeoff minimums and I can't think of an example (at ELP - they say "standard" minimums and give a specific climb gradient for some runways). For part 91, there are no standard minimums, so I believe only the climb gradient would apply.

Well, if it was a thin layer and I had a 1/4 or so on the ground, all other things considered, I'd probably go, but as with most others here, if it was too crappy to land, I'd probably stay on the ground. Meetings can be rescheduled. Lives can't. I can only remember one time when the boss man said we really need to go if we can. It was a tad less than that 1/4 on the ground and was kinda thick on top. I eased out and we broke thru at about 8 grand. He was sitting in the jump. I looked around as we broke out to see the sweat and hear a sigh of relief. He told me then not to listen to him anymore.lol

Think that some of these comments are not made by ones who have been around the airfield very much as have seen airliners take off without much vis. The return to airport quite often isnt an option due to layers but seems they go.

Personal Minimums are lifesavers for non professionals who don't fly 40 hours a month or so and don't encounter difficult situations frequently. Getting away with a risky take off or IFR approach a few times will embolden a pilot to take more and greater risks until the day comes when he encounters cumulo-granite clouds. Circling minimums for take off and approaches are just good sense if you don't do it every day.